ENVIRSCI 214 Lecture Notes - Lecture 15: Crypsis, Aposematism

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Large size, body armor, poison, mimicry (imitating other species or changing color to red when not poisonous), alter behavior, camouflage, bad smell, defensive circle. In theory, aposetism brings bright colors that stand out and are easy for the predator to learn the toxicity, hard to forget. Crypsis- choose compatible background and exhibit correct behavior(remaining motionless, camouflaging) Once predators found an orange with prey mites, the ate them all, and both prey and predator numbers on that orange dropped. But some prey dispersed to other oranges to get other prey. Predator and prey could coexist when lab arena of oranges was more complex and allowed prey to disperse to short-term refuges. Population cycles can be caused by exploitative interactions. Insights into population cycles have come from models, experiments, and field studies of predator-prey interactions. The lotka-voltera model is essentially the predator- prey equation that monitors the number of prey based on predator interaction and vice versa. dn/dt = rn - anp.

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